Fixed crash due to incomplete refactor in 5.0.27. Closes GH-1794.

This is the accompanying changelog entry for commits 4b3c037 and
3351281, which complete the empty LString refactor (triggered by
15aeba7).
[ci:skip]

CHANGELOG

@@ -3,6 +3,7 @@ Release 5.0.29
 
  * Fixes the FreeBSD build breaking due to the `-ldl` flag introduced by the LVE integration patch (5.0.28). Closes GH-1805.
  * Fixes per-application interpreter override (ruby, node, python) being ignored in mass deployment mode. Closes GH-1818.
+ * Fixes incomplete refactor from 5.0.27 that could, under specific conditions, lead to a Passenger crash. Closes GH-1794.
  * [Apache] Remove unused code that caused a crash in configurations with thousands of VirtualHost entries. Closes GH-1676.
  * [Nginx] Fixes use of invalid logfile name (memory already released) in backup log redirection code. Possibly related to GH-1774.
  * [Nginx] The preferred Nginx version is now 1.10.1 (previously 1.10.0).